An unqualified event name, equivalent to the Name property of the RoutedEvent field, not the actual member name of the RoutedEvent identifier field within a type. Without qualification, eventName must name an event as found in the type that is the TargetType of the current style containing the EventSetter or EventTrigger.

type

The type to use to qualify the event name. If provided without a prefix, type is expected to be a type within the default XAML namespace, and that can be mapped to an existing CLR type. For custom events, or events that are on types outside of the default XAML namespace, the string for type can include a prefix for a mapped XAML namespace. That XAML namespace should contain the XAML type that can map to a backing CLR type, and that CLR type should define the desired routed event identifier. For details on XAML namespace mapping, see XAML Namespaces and Namespace Mapping for WPF XAML.